Returning media object in background task

[Hadri]

@campopianoa @meredydd
How can we return the media object from background task running on the server?
It is not accepting this

anvil.server.task_state['results'] = X_media

Could you please help me?

[owen.campbell]

Add the resulting object to a data table with some sort of key that will let you find it. (You could use the task id, but you may have something more appropriate to use).

[anthonys]

You have to wait until the task is complete, then you can call task.get_return_value()

See the below post for more detail.

Transaction expiring randomly in background task

I was using the get_return_value method of the task object. This returns anything the task returns, or None if the task is incomplete. Is it better to use the state vs the return value? I am pinging the task in a timer for get_termination_status() and calling the return value. I didn’t know if using the state was better practice. Here is the code: def check_data_is_loaded(self): with anvil.server.no_loading_indicator: term_status = None term_status = self.task.get_termin…

[danbolinson]

This (task.get_return_value() actually isn’t possible with Media objects):

Returning List of Media Objects From Background Task

Hi all! The answer to this is that background tasks cannot return media objects directly (as @danbolinson theorised) - you’ll have to store them in Data Tables and retrieve them from there. The reasoning behind this is that the return values from background tasks can be accessed for a long time, and therefore it would be possible for large media objects to exhaust your data storage quota in a way that’s not very visible to you, or easy to fix. I hope this helps to clarify the situation here!

Instead, you have to return a key that will let you retrieve the media object from a data table, as Owen says.